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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 striving 4530
#2 Triode 3275
#3 infernosalex 2570
#4 milaiscute 2180
#5 tarik00 1910
Recent Solves
The Good, The Pad, The Ugly goldenbushrobin
Bytes and Big Integers Karim3
Working with Fields Inkius
Favourite byte khafi
XOR Properties khafi
Recent Solutions
Image Point Arithmetic infernosalex 0
Modular Square Root KOREONE 0
Legendre Symbol KOREONE 0
Diffusion through Permutation esraashrouf 0
Ticket Maestro (CryptoHack) klmn 0

Level Up

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